Process being throttled every 5 minutes, why?

Jun 29, 2020
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Hello friends,
I have a CentOS machine and a docker on it. I run a self-written Go application inside a container, which serves some HTML code over HTTPS.
Under heavier load, this application uses around 300% CPU. But every five minutes the CPU usage spikes up to 1000% and then goes down to like 30% and stays at 30% for like 30 seconds. Then it goes back to 300% again.
When this happens, the application stops serving requests until it goes back to 300% CPU usage.
I already checked the cgroups - it is unlimited for CPU - cfs_quota_us is -1.
What else could this be?

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